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ATP to ADP

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vane

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Nov 21, 2009, 2:20:00 PM11/21/09
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ATP is an energy carrier. It is supposed to release energy when it is
transformed to ADP. But, I was taught that the energy is released when
the chemical bond is formed not when the chemical bond is breaking
down. Where is mistake in my reasoning?
Thanks a lot, Vane
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Mark Thorson

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Nov 21, 2009, 3:48:39 PM11/21/09
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Bob wrote:

>
> On Sat, 21 Nov 2009 11:20:00 -0800 (PST), vane <ivan....@gmail.com>
> wrote:
>
> >ATP is an energy carrier. It is supposed to release energy when it is
> >transformed to ADP. But, I was taught that the energy is released when
> >the chemical bond is formed not when the chemical bond is breaking
> >down.
>
> correct.
>
> For ATP --> ADP, you need to look at the complete reaction, and the
> sum of all the bonds. ATP --> ADP is a shorthand. ATP + H2O --> ADP +
> Pi is still shorthand, but closer.

I know it's a violation of the cabal to reveal
the secrets of chemistry to a non-adept, but
the essential point is that although energy
is lost in the bond-breaking, greater energy
is released in the subsequent bond creation,
so the reaction is energetically favored.

dlzc

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Nov 21, 2009, 7:25:07 PM11/21/09
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Dear vane:

On Nov 21, 12:20 pm, vane <ivan.le...@gmail.com> wrote:
> ATP is an energy carrier.

Think what that means.

> It is supposed to release energy when it is
> transformed to ADP. But, I was taught that the
> energy is released when the chemical bond is
> formed not when the chemical bond is breaking
> down.

Exothermic reactions release heat / energy, and take the constituents
to a more stable state. Think everything from explosions to the
"light sticks".

Endothermic reactions absorb heat / energy. The emergency ice packs,
making steam form water, stuff like that.

> Where is mistake in my reasoning?

ATP is a "free radical". An unstable, or quasi-stable, state. ADP is
its stable form.

David A. Smith

Ian Gay

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Nov 22, 2009, 5:10:05 AM11/22/09
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dlzc wrote:

Where are the unpaired electrons ???

>
> David A. Smith

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dlzc

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Nov 22, 2009, 11:42:56 AM11/22/09
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Der Ian Gay:

On Nov 22, 3:10 am, Ian Gay <g...@sfu.ca> wrote:
> dlzc wrote:
...


> > ATP is a "free radical".  An unstable, or quasi-stable,
> > state.  ADP is its stable form.
>
> Where are the unpaired electrons ???

http://en.wikipedia.org/wiki/File:ATP_structure.svg

OK. It is not a free radical. That phosphorous does *not* look
happy. But it doesn't in ADP or AMP either...

David A. Smith

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